"Whether it's training here on ships or the BART station there are always different sights, sounds, distractions, that dogs pay attention to important to get them in different scenarios," said Nico Melendez, a TSA spokesperson.

Taking a boat cruise with Levi & Dusty! But it's not all leisure... They are about to do a drill & look for explosives. pic.twitter.com/7IMfuVUyaD

Dusty successfully found two detonation cords onboard a Hornblower ship, one dangling from a ceiling, the other hidden behind a counter. Her handler couldn't have been prouder. "That's a good girl," said Cravens.

The TSA is responsible for certifying police dogs for mass transportation systems. If a dog fails the TSA will know the animal needs more training.